Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40c0251d33cae9e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 23:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0edb1900d00ce2cb394e78f69a623f3 SHA-1: 330a860155740baa4cd6650aa3c7c6b79daa5be0 SHA-256: d40c0251d33cae9ef50af0edcf685101dd79f0fe133630666bdfe40003ddcbe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://clubselectionvoyages.com/images/file/13587793840.pdf In PDF document text
    • http://albesiaboutique.com/files/upload/files/jesomejimirarireb.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b82d64a2---gunewelojeterosuxule.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zagoma.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076438f56c6e---rijujosalolikiwanazoso.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b1c1b8c116725622ab19521ef0c9fde8/nesegisekakifu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/25580171105.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d37e273402a9f7e862d387743c5482f9/bapiwusa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a126d50b6b7---zipejadojodezi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/p05qpm07u63rd2nj0k74te39lv/wibutojedasufarovegajoja.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc40f505---59642580632.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0abc24b5---zifom.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa70d0bb42---37445597277.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/4832783032.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/46195472483.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98486833729.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/18269384418.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bf420661072df92257ed30b792845681/26409479811.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/32258a6aaa397d768edeff0e81798b32/19003950381.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dg2bo3mdq92gfbi0aca6scer63/pawabadutopubefevomofaf.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/9893152404.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d871b8ce30---kemaxuzinugalusorisi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fejiwefunidegunumegomeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+year+was+i+born+if+im+28PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 18116 bytes
SHA-256: 47dfb774e7eaf6e5a3682ac0d166b9938c8e692ca74fcb8eb1ab0d32299cdb7e
font_01_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 11092 bytes
SHA-256: 48b7b93f93e5f09fe34c8b2fa120ca91bfe268f7950f71f72b5b97a8b6bf365c

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